Letter opener



FIG. 1 is a front, top and left side perspective view of a letter opener showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view, the rear elevation view is a mirror image thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a left side elevational view thereof; and,

FIG. 6 is a right side elevational view thereof. 

I claim the ornamental design for a letter opener, as shown and described. 